US12339484B2ActiveUtilityA1
Light source apparatus and image display apparatus
Est. expiryMar 24, 2043(~16.7 yrs left)· nominal 20-yr term from priority
Inventors:Yuuki Maeda
G02B 6/005G02B 6/0031G02B 6/0055
64
PatentIndex Score
0
Cited by
2
References
19
Claims
Abstract
A light source apparatus includes a light source, and a light guide member which a light beam from the light source enters. The light guide member includes a reflector configured to reflect the light beam on a first surface of the light guide member, and a separator configured to separate the light beam on a second surface of the light guide member different from the first surface into a reflected light beam and a transmitting light beam. The light beam incident on the light guide member is reflected by each of the reflector and the separator and propagates in a first direction. Among light beams propagated through the light guide member, the light beam separated by the separator is emitted from the light guide member. An incident angle of the light beam incident on the second surface of the light guide member is smaller than a critical angle.
Claims
exact text as granted — not AI-modifiedWhat is claimed is:
1. A light source apparatus comprising:
a light source; and
a light guide member which a light beam from the light source enters,
wherein the light guide member includes:
a reflector configured to reflect the light beam on a first surface of the light guide member, and
a separator configured to separate the light beam on a second surface of the light guide member different from the first surface into a reflected light beam and a transmitting light beam,
wherein the light beam incident on the light guide member is reflected by each of the reflector and the separator and propagates in a first direction,
wherein among light beams propagated through the light guide member, the light beam separated by the separator is emitted from the light guide member,
wherein an incident angle of the light beam incident on the second surface of the light guide member is smaller than a critical angle, and
wherein the following inequality is satisfied:
0
≤
T
(
A
)
<
20
where T (A) is a transmittance (%) of the reflector in a case where an incident angle A (degrees) of a principal ray incident on the reflector is 10 degrees or higher regarding a peak wavelength of the light beam at which the light source has maximum efficiency.
2. The light source apparatus according to claim 1 , wherein each of the separator and the reflector includes a dielectric multilayer film.
3. The light source apparatus according to claim 1 , wherein the following inequality is satisfied regarding the peak wavelength of the light beam where the incident angle A is 0 degrees:
80
<
T
(
0
)
≤
100.
4. The light source apparatus according to claim 1 , wherein the separator has N areas that include a first area, . . . , an (N−1)th area, and an Nth area in order along the first direction, and the following inequality is satisfied:
1.1
×
T
[
N
-
1
]
<
T
[
N
]
where T [N−1] is a transmittance (%) of a light beam incident on the (N−1)th area and T [N] is a transmittance (%) of a light beam incident on the Nth area regarding a peak wavelength of the light beam at which the light source has maximum efficiency.
5. The light source apparatus according to claim 1 , wherein the following inequality is satisfied:
0.
<
W
/
R
<
0.03
where R (nm) is a center wavelength of at least one spectrum of the light beam from the light source, and W (nm) is a half maximum full-width.
6. The light source apparatus according to claim 1 ,
wherein the light source includes a laser light source and a collimator, and
wherein the collimator collimates the light beam from the laser light source to make illuminance distribution uniform.
7. The light source apparatus according to claim 1 ,
wherein the light guide member includes a light guide plate, and
wherein the second surface is a surface of the light guide plate opposite to the first surface of the light guide plate.
8. The light source apparatus according to claim 1 ,
wherein the light guide member includes a first flat plate and a second flat plate,
wherein the second surface of the second flat plate is a surface opposite to the first surface of the first flat plate, and
wherein the light beam incident on the light guide member is reflected in space sandwiched between the first flat plate and the second flat plate and propagates in the first direction.
9. An image display apparatus comprising:
the light source apparatus according to claim 1 ; and
an image display element,
wherein the light beam emitted from the light guide member illuminates the image display element.
10. The image display apparatus according to claim 9 , wherein each of the separator and the reflector includes a dielectric multilayer film.
11. The image display apparatus according to claim 9 , wherein the following inequality is satisfied:
0
≤
T
(
A
)
<
20
where T (A) is a transmittance (%) of the reflector in a case where an incident angle A (degrees) of a principal ray incident on the reflector is 10 degrees or higher regarding a peak wavelength of the light beam at which the light source has maximum efficiency.
12. The image display apparatus according to claim 11 , wherein the following inequality is satisfied regarding the peak wavelength of the light beam where the incident angle A is 0 degrees:
80
<
T
(
0
)
≤
100.
13. The image display apparatus according to claim 9 , wherein the separator has N areas that include a first area, . . . , an (N−1)th area, and an Nth area in order along the first direction, and the following inequality is satisfied:
1.1
×
T
[
N
-
1
]
<
T
[
N
]
where T [N−1] is a transmittance (%) of a light beam incident on the (N−1)th area and T [N] is a transmittance (%) of a light beam incident on the Nth area regarding a peak wavelength of the light beam at which the light source has maximum efficiency.
14. The image display apparatus according to claim 9 , wherein the following inequality is satisfied:
0.
<
W
/
R
<
0.03
where R (nm) is a center wavelength of at least one spectrum of the light beam from the light source, and W (nm) is a half maximum full-width.
15. The image display apparatus according to claim 9 ,
wherein the light source includes a laser light source and a collimator, and
wherein the collimator collimates the light beam from the laser light source to make illuminance distribution uniform.
16. The image display apparatus according to claim 9 ,
wherein the light guide member includes a light guide plate, and
wherein the second surface is a surface of the light guide plate opposite to the first surface of the light guide plate.
17. The image display apparatus according to claim 9 ,
wherein the light guide member includes a first flat plate and a second flat plate,
wherein the second surface of the second flat plate is a surface opposite to the first surface of the first flat plate, and
wherein the light beam incident on the light guide member is reflected in space sandwiched between the first flat plate and the second flat plate and propagates in the first direction.
18. A light source apparatus comprising:
a light source; and
a light guide member which a light beam from the light source enters,
wherein the light guide member includes:
a reflector configured to reflect the light beam on a first surface of the light guide member, and
a separator configured to separate the light beam on a second surface of the light guide member different from the first surface into a reflected light beam and a transmitting light beam,
wherein the light beam incident on the light guide member is reflected by each of the reflector and the separator and propagates in a first direction,
wherein among light beams propagated through the light guide member, the light beam separated by the separator is emitted from the light guide member,
wherein an incident angle of the light beam incident on the second surface of the light guide member is smaller than a critical angle, and
wherein the separator has N areas that include a first area, . . . , an (N−1)th area, and an Nth area in order along the first direction, and the following inequality is satisfied:
1.1× T[N− 1]< T[N]
where T [N−1] is a transmittance (%) of a light beam incident on the (N−1)th area and T [N] is a transmittance (%) of a light beam incident on the Nth area regarding a peak wavelength of the light beam at which the light source has maximum efficiency.
19. A light source apparatus comprising:
a light source; and
a light guide member which a light beam from the light source enters,
wherein the light guide member includes:
a reflector configured to reflect the light beam on a first surface of the light guide member, and
a separator configured to separate the light beam on a second surface of the light guide member different from the first surface into a reflected light beam and a transmitting light beam,
wherein the light beam incident on the light guide member is reflected by each of the reflector and the separator and propagates in a first direction,
wherein among light beams propagated through the light guide member, the light beam separated by the separator is emitted from the light guide member,
wherein an incident angle of the light beam incident on the second surface of the light guide member is smaller than a critical angle, and
wherein the following inequality is satisfied:
0.000< W/R< 0.030
where R (nm) is a center wavelength of at least one spectrum of the light beam from the light source, and W (nm) is a half maximum full-width.Cited by (0)
No later patents cite this yet.
References (0)
No backward citations on record.